Wearing a warmer cloth can also help in this regard. Put a warm compress in your extremity for about 10 to 15 minutes before the blood extraction. If you raise the temperature of your extremities, the blood flow will increase in the area, which can help the phlebotomist (the person who will draw your blood) find a good vein more quickly. Situations such as dehydration, lack of sleep, stress and smoking can also affect the result. Some activities can also alter the outcome of various tests, such as intense physical activity and sexual activity. You already know that you’d better not drink coffee before blood tests that need fasting, and it is also important to know other things to do before a blood test. After the blood sample is taken, you can eat what you want. You must not eat or drink anything other than plain water, as other kind of beverages, including flavored or sparkling water, can alter your results. Count backwards from the time of your appointment to make sure you start fasting at the appropriate time. You must follow the instructions provided by your doctor and/or the testing laboratory. A fasting of 8 to 12 hours prior to the test is needed. You may be required to stay in the lab up to 5 hours. This test is usually done when a blood sugar alteration is suspected. Glucose Tolerance Test: This will measure your glucose levels every 30 to 60 minutes after giving you a high-sugar substance to evaluate your body’s response to it.Fasting Glucose Test: It is usually the first step to evaluate your glucose levels, and you must have a fasting for about 8 to 12 hours prior to it.It requires you to fast for 9 to 12 hours before the blood sample is taken. Serum Lipid Test: This blood test analyzes your triglycerides and/or cholesterol levels.So you’d better avoid drinking any kind of coffee before blood tests that need fasting. Note: Even if the caffeinated beverage is sugar-free, decaffeinated or has natural sweeteners, it is still going to produce changes in your body. Drinking coffee before taking a blood test can alter your glucose levels and mislead your doctor into thinking you may be suffering from high blood sugar or diabetes. Coffee Affects Your Blood Sugar LevelsĬaffeine is quickly absorbed by the body. Because of this, your tests results can show something that does not correlate to the reality of your health condition. Caffeine usually leaves the bloodstream in about four hours, but your kidneys will take more time to readjust your acid/base balance and electrolyte levels. Despite its water content, certain elements present in the coffee have vasoconstriction and diuretic effects, which will lead to dehydration. Levels of electrolytes and gastric pH can become affected, as well as your cardiac frequency and blood pressure. Coffee Affects Your BloodĪ small amount of coffee can alter your blood test results. Failing to do so can lead to alterations of your blood components and misinterpretation of your health state. If your doctor told you to fast before the blood test, you must avoid drinking or eating anything, including coffee before the blood sample is taken. Some tests do not require fasting, while others do. This depends on the type of test that is going to be done on you.
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